U.S. patent application number 10/902434 was filed with the patent office on 2005-03-17 for light receiving and emitting electronic apparatus.
This patent application is currently assigned to ROHM CO., LTD.. Invention is credited to Fujino, Junji, Noguchi, Yoichiro.
Application Number | 20050057169 10/902434 |
Document ID | / |
Family ID | 34277597 |
Filed Date | 2005-03-17 |
United States Patent
Application |
20050057169 |
Kind Code |
A1 |
Noguchi, Yoichiro ; et
al. |
March 17, 2005 |
Light receiving and emitting electronic apparatus
Abstract
A light receiving and emitting electronic apparatus having a
light emitting device, a light receiving device, and a driving
device for driving the light emitting device and the light
receiving device, and serving to transmit/receive data to/from an
outside through the light emitting device and the light receiving
device, comprising a data signal input terminal for inputting a
data signal from a data signal control device for controlling the
driving device in order to transmit/receive data to/from the
outside, a remote control signal input terminal for inputting a
remote control signal from a remote control signal control device
for controlling the driving device in order to remotely operate an
external electronic apparatus, first current generating means for
driving a suitable current for transmitting and receiving data into
the light emitting device, second current generating means for
driving a suitable current for transmitting the remote control
signal into the light emitting device, and means for selectively
switching the first and second current generating means.
Inventors: |
Noguchi, Yoichiro; (Kyoto,
JP) ; Fujino, Junji; (Kyoto, JP) |
Correspondence
Address: |
MORGAN LEWIS & BOCKIUS LLP
1111 PENNSYLVANIA AVENUE NW
WASHINGTON
DC
20004
US
|
Assignee: |
ROHM CO., LTD.
|
Family ID: |
34277597 |
Appl. No.: |
10/902434 |
Filed: |
July 30, 2004 |
Current U.S.
Class: |
315/150 |
Current CPC
Class: |
H04B 10/1143
20130101 |
Class at
Publication: |
315/150 |
International
Class: |
H05B 037/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 31, 2003 |
JP |
P2003-284576 |
Jun 10, 2004 |
JP |
P2004-172504 |
Claims
What is claimed is:
1. A light receiving and emitting electronic apparatus comprising:
a light emitting device; a light receiving device, and a driving
device for driving the light emitting device and the light
receiving device, and serving to transmit/receive data to/from an
outside through the light emitting device, wherein said light
receiving device is further comprising: a data signal input
terminal for inputting a data signal from a data signal control
device for controlling the driving device in order to
transmit/receive data to/from outside; a remote control signal
input terminal for inputting a remote control signal from a remote
control signal control device for controlling the driving device in
order to remotely operate an external electronic apparatus, first
current generating means for driving a suitable current for
transmitting and receiving data into the light emitting device;
second current generating means for driving a suitable current for
transmitting the remote control signal into the light emitting
device, and means for selectively switching the first current
generating means and second current generating means.
2. The light receiving and emitting electronic apparatus according
to claim 1, wherein both a data signal sent from the data signal
control device and a remote control signal sent from the remote
control signal control device are provided to any one of the data
signal input terminal and the remote control signal input
terminal.
3. A driving device comprising: first current generating means for
driving a suitable current for transmitting data into a light
emitting device; second current generating means for driving a
suitable current for transmitting a remote control signal into the
light emitting device; means for selectively switching the first
and second current generating means; a terminal for transmitting a
signal to the light emitting device, and a terminal for receiving a
signal from a light receiving device.
4. The driving device according to claim 3, wherein said driving
device is used for a light receiving and emitting electronic
apparatus with said light emitting device connected to the terminal
for transmitting the signal to the light emitting device, and the
light receiving device which is connected to the terminal for
receiving a signal from the light receiving device.
5. The light receiving and emitting electronic apparatus
comprising; a light emitting device for emitting a light signal; a
light receiving device for receiving a light signal, and a driving
device which includes at least first current generating means for
driving a suitable current for transmitting data into the light
emitting device; second current generating means for driving a
suitable current for transmitting a remote control signal into the
light emitting device, and two input terminals, wherein if a data
signal control device for controlling the driving device so as to
transmit/receive data to/from an outside, and a remote control
signal control device for controlling the driving device so as to
remotely operate an external electronic apparatus are both provided
simultaneously, a data signal is then input from the data signal
control device to one of said two input terminals, and a remote
control signal is input from the remote control signal control
device to another input terminal, and if only a data-remote
controller for controlling the driving device is adopted so as to
transmit/receive data to/from the outside and control the driving
device for remotely operating the external electronic apparatus,
either of the two input terminals can be available for said control
by the data-remote controller in any which case of the signal
thereof being input from the data-remote controller.
6. The light receiving and emitting electronic apparatus
comprising; a light emitting device for emitting a light signal; a
light receiving device for receiving a light signal, and a driving
device which includes at least first current generating means for
driving a suitable current for transmitting data into the light
emitting device; second current generating means for driving a
suitable current for transmitting a remote control signal into the
light emitting device, a first input terminal, and a second input
terminal, wherein if a data signal control device for controlling
the driving device so as to transmit/receive data to/from an
outside, and a remote control signal control device for controlling
the driving device so as to remotely operate an external electronic
apparatus are both provided simultaneously, a data signal is then
input from the data signal control device to a first input
terminals, and a remote control signal is input from the remote
control signal control device to said second input terminal, and if
only a data-remote controller for controlling the driving device is
adopted so as to transmit/receive data to/from the outside and
control the driving device for remotely operating the external
electronic apparatus, said second input terminal can be then
available for receiving an input signal from said data-remote
controller.
7. The light receiving and emitting electronic apparatus
comprising; a light emitting device for emitting a light signal; a
light receiving device for receiving a light signal, and a driving
device which includes at least first current generating means for
driving a suitable current for transmitting data into the light
emitting device; second current generating means for driving a
suitable current for transmitting a remote control signal into the
light emitting device, a first input terminal, and a second input
terminal, wherein if a data signal control device for controlling
the driving device so as to transmit/receive data to/from an
outside, and a remote control signal control device for controlling
the driving device so as to remotely operate an external electronic
apparatus are both provided simultaneously, a data signal is then
input from the data signal control device to a first input
terminals, and a remote control signal is input from the remote
control signal control device to said second input terminal, and if
only a data-remote controller for controlling the driving device is
adopted so as to transmit/receive data to/from the outside and
control the driving device for remotely operating the external
electronic apparatus, said first input terminal can be then
available for receiving an input signal from said data-remote
controller.
8. The light receiving and emitting electronic apparatus according
to any of claims 1, 2, 6 and 7, wherein the light emitting device
is an LED and the light receiving device is a photodiode.
9. The light receiving and emitting electronic apparatus according
to any of claims 1-4, 6 and 7, wherein the data signal control
device is an IrDA controller.
10. The light receiving and emitting electronic apparatus according
to any of claims 1, 2, 6 and 7, wherein said driver device is used
for a mobile terminal having the light receiving and emitting
devices.
11. The driving device according to claim 3, wherein said driving
device is used for a mobile terminal having the light receiving and
emitting devices.
Description
BACKGROUND OF THE INVENTION
[0001] 1.Field of the Invention
[0002] The present invention relates to a light receiving and
emitting electronic apparatus comprising so-called light emitting
and receiving devices, and includes an electronic apparatus to be
used as communicating means, for example. An IrDA module to be
incorporated into a mobile phone for carrying out an infrared
communication in accordance with a standard made by an IrDA
(Infrared Data Association: a standardized group for promoting the
mutual connection of a data communication using infrared rays)
corresponds to the electronic apparatus according to the
invention.
[0003] 2.Description of the Related Art
[0004] Reflecting the recent spread of a mobile terminal and the
prevalence of a reduction in a size and an increased multiplex
functions, an IrDA module in a mobile phone is not limited to a
data exchange function such as the exchange of a telephone number
which is a conventional function, but rather, a mobile phone 13,
which incorporates an IrDA module 100 with a remote control
transmitting function such as the remote control transmitting
function for controlling electric household appliances as shown in
FIG. 1, has been introduced into the market. This was realized
because the wavelength of a light signal emitted from the IrDA
module 100, which transmits an IrDA data signal as a kind of data
signals, and the wavelength of a light signal of a remote
controller used for a remote control operation areal most identical
to eachother. Therefore, both functions of data exchange performed
by the IrDA module 100 and remote control performed by the remote
control circuit can be implemented by using the same light emitting
device by changing the drive current of an LED 122 as a light
emitting device and regulating the radiant intensity thereof.
[0005] As shown in FIG. 1, the mobile phone 13 corresponding to the
remote control transmitting function is provided with the IrDA
module 100, a data signal control device (an IrDA controller 2)
provided on the outside of the IrDA module 100 and serving to
control a timing for driving current generating means (an IrDA
driver) to drive the LED 122 which is controlled by a CPU 4 of the
mobile phone, a first resistor 6 (R1) for regulating the radiant
intensity of the LED 122, a remote control signal control device (a
remote controller 3) provided on the outside of the IrDA module 100
and serving to control a timing for driving the current generating
means (the remote control driver) to drive the LED 122 which is
controlled by the CPU 4 of the mobile phone in order to correspond
to a remote control transmitting function in addition to an LEDVCC
5 to be the driving voltage of the LED 122, a switch 8 (SW) for
selecting a radiant intensity which is suitable for transmitting an
IrDA data signal from the IrDA controller 2 or a radiant intensity
which is suitable for transmitting a remote control signal sent
from the remote controller 3, and a second resistor 7 (R2)
therefor, and is thus constituted together with a display portion
12, an antenna 9, a communication CPU 10 for controlling the
antenna 9, and a keyboard 11 which are other components.
[0006] FIG. 2 is a detailed block diagram in which the IrDA module
100 is incorporated into the mobile phone 13 shown in FIG. 1
(before a remote control transmitting function is added) and FIG. 3
is a detailed block diagram in which the IrDA module 100 is mounted
on the mobile phone 13 shown in FIG. 1 (after the remote control
transmitting function is added). The IrDA module 100 is constituted
by the LED 122 for converting an electric signal sent from the
mobile phone 13 into a light signal and transmitting the same light
signal, a photodiode 120 for receiving data from an outside through
the light signal and converting the same light signal into an
electric signal, a driving device 121 for driving the LED 122 and
the photodiode 120, a board 123, and terminal groups 125 to
129.
[0007] In the mobile phone 13 shown in FIG. 1, a timing for causing
the LED 122 to emit a light is controlled depending on the use of
the IrDA controller 2 or the remote controller 3 and a radiant
intensity is regulated by controlling the drive current of the LED
122 depending on the transmission of a signal sent from the IrDA
controller 2 or a signal sent from the remote controller 3, thereby
transmitting a desirable light signal. More specifically, in the
transmission of a remote control signal using the remote controller
3 requiring a higher radiant intensity than that in the
transmission of the IrDA data signal using the IrDA controller 2,
the second resistor 7 is not used but only the first resistor 6 is
used through the switch 8 attached to the outside of the IrDA
module 100, thereby increasing the drive current of the LED 122. As
compared with the transmission of the IrDA data signal using the
IrDA controller 2, a larger current is driven to the LED 122. Thus,
the LED 122 is caused to emit a light with a radiant intensity
which is suitable for the transmission of a remote control signal,
and the remote control signal is thus transmitted. Moreover, a
lower radiant intensity than that in the transmission of the remote
control signal using the remote controller 3 is used for the
transmission of the IrDA data signal using the IrDA controller 2.
By using two resistors, that is, the second resistor 7 and the
first resistor 6 through the switch 8 attached to the outside,
therefore, a smaller current than that in the transmission of the
remote control signal is driven to the LED 122 and the LED 122 is
caused to emit a light with a radiant intensity which is suitable
for the transmission of the IrDA data signal, and the IrDA data
signal is thus transmitted.
SUMMARY OF THE INVENTION
[0008] In consideration of the conventional actual circumstances,
the invention has been made to eliminate drawbacks inherent in the
conventional art, and therefore, has a first object to provide a
light receiving and emitting electronic apparatus mainly comprising
an IrDA module having a remote control transmitting function which
includes an interface to easily satisfy the specification of an
external part to be changed by various products without requiring
to dispose, on the outside of the light receiving and emitting
electronic apparatus, a change-over switch for regulating the drive
current of a light emitting device, and excessive wirings and
resistors therefor, and has a second object to provide a mobile
terminal using the light receiving and emitting electronic
apparatus.
[0009] The first object can be attained by a first aspect of the
invention which is directed to a light receiving and emitting
electronic apparatus having a light emitting device, a light
receiving device, and a driving device for driving the light
emitting device and the light receiving device, and serving to
transmit/receive data to/from an outside through the light emitting
device and the light receiving device, comprising a data signal
input terminal for inputting a data signal from a data signal
control device for controlling the driving device in order to
transmit/receive data to/from the outside, a remote control signal
input terminal for inputting a remote control signal from a remote
control signal control device for controlling the driving device in
order to remotely operate an external electronic apparatus, first
current generating means for driving a suitable current for
transmitting and receiving data into the light emitting device,
second current generating means for driving a suitable current for
transmitting the remote control signal into the light emitting
device, and means for selectively switching the first and second
current generating means.
[0010] The first object can be attained by a second aspect of the
invention which is directed to the light receiving and emitting
electronic apparatus according to the first aspect of the
invention, wherein both a data signal sent from the data signal
control device and a remote control signal sent from the remote
control signal control device are input to either of the data
signal input terminal and the remote control signal input
terminal.
[0011] The first object can be attained by a third aspect of the
invention which is directed to a driving device comprising first
current generating means for driving a suitable current for
transmitting data into a light emitting device, second current
generating means for driving a suitable current for transmitting a
remote control signal into the light emitting device, means for
selectively switching the first and second current generating
means, a terminal for transmitting a signal to the light emitting
device, and a terminal for receiving a signal from a light
receiving device.
[0012] The first object can be attained by a fourth aspect of the
invention which is directed to a light receiving and emitting
electronic apparatus comprising a light emitting device connected
to a terminal for transmitting a signal to the light emitting
device, a light receiving device connected to a terminal for
receiving a signal from the light receiving device, and the driving
device according to the third aspect of the invention.
[0013] The first object can be attained by a fifth aspect of the
invention which is directed to the light receiving and emitting
electronic apparatus according to the fourth aspect of the
invention, further comprising a data signal input terminal for
inputting a data signal from a data signal control device for
controlling the driving device in order to transmit/receive data
to/from an outside, and a remote control signal input terminal for
inputting a remote control signal from a remote control signal
control device for controlling the driving device in order to
remotely operate an external electronic apparatus.
[0014] The first object can be attained by a sixth aspect of the
invention which is directed to the light receiving and emitting
electronic apparatus according to the fourth aspect of the
invention, further comprising an input terminal for inputting a
signal from a control device serving as a data/remote controller
which serves to control the driving device in order to
transmit/receive data to/from an outside and to control the driving
device in order to remotely operate an external electronic
apparatus.
[0015] The first object can be attained by a seventh aspect of the
invention which is directed to the light receiving and emitting
electronic apparatus according to the fourth aspect of the
invention, further comprising at least two input terminals,
[0016] wherein in the case in which a data signal control device
for controlling the driving device in order to transmit/receive
data to/from an outside and a remote control signal control device
for controlling the driving device in order to remotely operate an
external electronic apparatus are provided separately,
[0017] a data signal is input from the data signal control device
to one of the input terminals of the light receiving and emitting
electronic apparatus and a remote control signal is input from the
remote control signal control device to the other input terminal of
the light receiving and emitting electronic apparatus, and
[0018] in the case in which a control device serving as a
data/remote controller for controlling the driving device in order
to transmit/receive data to/from the outside and controlling the
driving device in order to remotely operate the external electronic
apparatus is used,
[0019] it can be used even if a signal is input from the control
device serving as a data/remote controller to either of the two
input terminals of the light receiving and emitting electronic
apparatus.
[0020] The first object can be attained by an eighth aspect of the
invention which is directed to the light receiving and emitting
electronic apparatus according to the fourth aspect of the
invention, further comprising at least two input terminals,
[0021] wherein in the case in which a data signal control device
for controlling the driving device in order to transmit/receive
data to/from an outside and a remote control signal control device
for controlling the driving device in order to remotely operate an
external electronic apparatus are provided separately,
[0022] a data signal is input from the data signal control device
to one of the input terminals of the light receiving and emitting
electronic apparatus and a remote control signal is input from the
remote control signal control device to the other input terminal of
the light receiving and emitting electronic apparatus, and
[0023] in the case in which a control device serving as a
data/remote controller for controlling the driving device in order
to transmit/receive data to/from the outside and controlling the
driving device in order to remotely operate the external electronic
apparatus is used,
[0024] a signal is input from the control device serving as a
data/remote controller to the input terminal to which the remote
control signal is input when the data signal control device and the
remote control signal control device are provided separately.
[0025] The first object can be attained by a ninth aspect of the
invention which is directed to the light receiving and emitting
electronic apparatus according to the fourth aspect of the
invention, further comprising at least two input terminals,
[0026] wherein in the case in which a data signal control device
for controlling the driving device in order to transmit/receive
data to/from an outside and a remote control signal control device
for controlling the driving device in order to remotely operate an
external electronic apparatus are provided separately,
[0027] a data signal is input from the data signal control device
to one of the input terminals of the light receiving and emitting
electronic apparatus and a remote control signal is input from the
remote control signal control device to the other input terminal of
the light receiving and emitting electronic apparatus, and
[0028] in the case in which a control device serving as a
data/remote controller for controlling the driving device in order
to transmit/receive data to/from the outside and controlling the
driving device in order to remotely operate the external electronic
apparatus is used,
[0029] a signal is input from the control device serving as a
data/remote controller to the input terminal to which the data
signal is input when the data signal control device and the remote
control signal control device are provided separately.
[0030] The first object can be attained by a tenth aspect of the
invention which is directed to the light receiving and emitting
electronic apparatus according to any of the first, second and
fourth to ninth aspects of the invention, wherein the light
emitting device is an LED and the light receiving device is a
photodiode.
[0031] The first object can be attained by an eleventh aspect of
the invention which is directed to the light receiving and emitting
electronic apparatus according to any of the first, second and
fourth to tenth aspects of the invention, wherein the data signal
control device is an IrDA controller.
[0032] The second object can be attained by a twelfth aspect of the
invention which is directed to a mobile terminal mounting the light
receiving and emitting electronic apparatus according to any of the
first, second and fourth to eleventh aspects of the invention.
[0033] When designing a mobile phone incorporating an IrDA module
according to an example of a light receiving and emitting
electronic apparatus, it is possible to carry out the design
without providing, on the outside of the IrDA module, a switch for
regulating the radiant intensity of an LED to be mounted on the
IrDA module, and excessive wirings and resistors. In the mobile
phone desired to reduce a size, in many cases, an IrDA module
having a remote control transmitting function according to an
example of the light receiving and emitting electronic apparatus in
accordance with the invention is particularly mounted on the tip
portion of a mobile terminal to depend on the size of the circuit
board of the mobile terminal. In such cases, it is possible to
reduce the size of the circuit board of the mobile terminal which
is linked to a reduction in a size. When designing the mobile
terminal, moreover, the IrDA module having a remote control
transmitting function according to an example of the light
receiving and emitting electronic apparatus in accordance with the
invention is used for a sudden change in a wiring or a change in
the number of controllers to be mounted. Consequently,
disadvantages can be caused by the change with difficulty. More
specifically, it is possible to provide an interface for easily
satisfying the specification of the outside of the light receiving
and emitting electronic apparatus which is changed depending on a
product.
BRIEF DESCRIPTION OF THE DRAWINGS
[0034] FIG. 1 is a schematic diagram showing a mobile phone having
a remote control transmitting function mounting a conventional IrDA
module and a remote controller for adding the remote control
transmitting function thereto, in which the transmission of a
remote control signal and an IrDA data signal is carried out by
using the mobile phone,
[0035] FIG. 2 is a block diagram showing the connection of the
conventional IrDA module, an IrDA controller and an LEDVCC (before
the remote control transmitting function is added),
[0036] FIG. 3 is a block diagram showing the connection of the
conventional IrDA module, the IrDA controller, the remote
controller and the LEDVCC (after the remote control transmitting
function is added),
[0037] FIG. 4 is a perspective view showing the appearance of an
IrDA module having a remote control transmitting function according
to an example of a light receiving and emitting electronic
apparatus,
[0038] FIG. 5 is a block diagram showing the connection of the IrDA
module having a remote control transmitting function according to
the example of the light receiving and emitting electronic
apparatus in accordance with the invention, the IrDA controller,
the remote controller and the LEDVCC (the IrDA controller and the
remote controller are provided separately),
[0039] FIG. 6 is a block diagram showing the connection of the IrDA
module having a remote control transmitting function according to
the example of the light receiving and emitting electronic
apparatus in accordance with the invention, a controller serving as
an IrDA remote/controller and the LEDVCC (the IrDA controller and
the remote controller are used together), and
[0040] FIG. 7 is a block diagram showing the IrDA module having a
remote control transmitting function according to the example of
the light receiving and emitting electronic apparatus in accordance
with the invention which mainly includes a driving device.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0041] The best mode for carrying out the invention will be
described below.
[0042] FIG. 1 is a schematic diagram showing a mobile phone having
a remote control transmitting function mounting a conventional IrDA
module and a remote controller for adding the remote control
transmitting function thereto, in which the transmission of a
remote control signal and an IrDA data signal is carried out by
using the mobile phone, FIG. 2 is a block diagram showing the
connection of the conventional IrDA module, an IrDA controller and
an LEDVCC (before the remote control transmitting function is
added), FIG. 3 is a block diagram showing the connection of the
conventional IrDA module, the IrDA controller, the remote
controller and the LEDVCC (after the remote control transmitting
function is added), FIG. 4 is a perspective view showing the
appearance of an IrDA module having a remote control transmitting
function according to an example of a light receiving and emitting
electronic apparatus in accordance with the invention, FIG. 5 is a
block diagram showing the connection of the IrDA module having a
remote control transmitting function according to the example of
the light receiving and emitting electronic apparatus in accordance
with the invention, the IrDA controller, the remote controller and
the LEDVCC (the IrDA controller and the remote controller are
provided separately), FIG. 6 is a block diagram showing the
connection of the IrDA module having a remote control transmitting
function according to the example of the light receiving and
emitting electronic apparatus in accordance with the invention, a
controller serving as an IrDA/remote controller and the LEDVCC (the
IrDA controller and the remote controller a reused together), and
FIG. 7 is a block diagram showing the IrDA module having a remote
control transmitting function according to the invention which
mainly includes a driving device.
[0043] The light receiving and emitting electronic apparatus
according to the invention is generally constituted by a board 23
formed to take a long rectangular shape seen on a plane, a light
emitting device, a light receiving device and a driving device 21
which are mounted on the board 23, and a sealing member 30 formed
by a resin package for integrally sealing them. Examples of the
light receiving and emitting electronic apparatus include an IrDA
module 1 having a remote control transmitting function in which an
LED 22 is set to be the light emitting device and a photodiode 20
is set to be the light receiving device. The board 23 is formed by
a glass epoxy resin and a predetermined wiring pattern of a
conductor (not shown) is formed on a surface thereof. A plurality
of connecting terminal portions 33 provided with a conductor layer
on the internal surface of a concave groove extended in the
direction of the thickness of the board 23 is formed on the side
surface of the board 23. The connecting terminal portions 33 are
connected to the wiring pattern formed on the surface of the board
23. Moreover, a light emitting lens 31 is formed on the surface
opposed to the LED 22 and a light receiving lens 32 is formed on
the surface opposed to the photodiode 20.
[0044] The LED 22 is mounted on the board 23, and is subjected to
wire bonding through a gold wire and is connected to a wiring
pattern. In the same manner as the LED 22, the photodiode 20 is
mounted on the board 23, and is subjected to the wire bonding
through the gold wire and is connected to the wiring pattern.
Moreover, the driving device 21 serves to control the transmitting
and receiving operations of the LED 22 and the photodiode 20, and
is mounted on the board 23, is subjected to the wire bonding
through the gold wire and is connected to the wiring pattern, and
furthermore, is connected to the LED 22 and the photodiode 20
through the wiring pattern.
[0045] As a matter of course, the number of the terminals of the
connecting terminal portion 33 is not restricted to eight as shown
in FIG. 4. Moreover, a shield case for suppressing the influence of
an ambient electromagnetic wave may be provided to cover the
external shape of the IrDA module 1 having a remote control
transmitting function, which is not shown.
[0046] Next, description will be given to a method of mounting the
IrDA module 1 having a remote control transmitting function
according to an example of the light receiving and emitting
electronic apparatus shown in FIG. 4 on a circuit board (an
external circuit board) of a mobile terminal. A wiring pattern of a
conductor corresponding to each connecting terminal 33 of the IrDA
module 1 having a remote control transmitting function is formed on
the surface of the external circuit board. When mounting the IrDA
module 1 having a remote control transmitting function on the
external circuit board, the back face of the board 23 is mounted in
an orthogonal direction to the surface of the external circuit
board and the connecting terminal portion 33 and a wiring pattern
formed on the surface of the external circuit board are bonded to
each other through soldering. In this case, an opening portion to
be the board terminal connecting portion 33 is constituted to be
mounted on the wiring pattern of the conductor. In the IrDA module
1 having a remote-control transmitting function, the back face of
the board 23 may be mounted to abut on the external circuit
board.
[0047] The IrDA module 1 having a remote control transmitting
function which is connected to the external circuit board through
the soldering and a controller for giving a control signal to the
IrDA module 1 having a remote control transmitting function to
transmit a desirable signal are connected to each other through the
wiring pattern of the conductor on the surface of the external
circuit board. There are the case in which an IrDA controller 2 and
a remote controller 3 are provided as separate controllers on the
external circuit board as shown in FIG. 5 and the case in which a
controller 50 using the IrDA controller and are mote controller
together (a controller serving as an IrDA/remote controller) is
provided on the external circuit board as shown in FIG. 6.
[0048] Next, description will be given to the operations of the
driving device and the IrDA module which are divided into the case
in which the IrDA controller 2 and the remote controller 3 are used
separately (FIG. 5) and the case in which the controller 50 serving
as the IrDA/remote controller is used (FIG. 6).
[0049] In the case in which the IrDA controller 2 and the remote
controller 3 are used separately (FIG. 5), a pad 6 (45), a pad 7
(46) and a pad 9 (48) of the driving device 21 shown in FIG. 7 are
connected to three input terminals, that is, a TX-RC terminal 24 to
be a remote control signal input terminal, a PWDOWN terminal 25 and
a TXD terminal 27 to be a data signal input terminal through wire
bonding or a wiring pattern, respectively. Therefore, the IrDA
module 1 having a remote control transmitting function carries out
five operations of "a" to "e" shown in Table 1 depending on a
signal state into the three input terminals.
1 TABLE 1 INPUT Status PWDOWN TX-RC TXD LED Mode Receiver a L L L
OFF ON b L L H IrDA ON c L H L Remote ON b L H H IrDA ON d H L L
OFF OFF e H L H Remote OFF e H H L Remote OFF e H H H Remote
OFF
[0050] More specifically, a) in the case in which the PWDOWN
terminal 25, the TX-RC terminal 24 and the TXD terminal 27 are low
level states (L), a switch 41 is brought into such a state as to
transmit a signal to neither an IrDA driver 42 to be current
generating means for regulating a current to flow to the LED 22 in
order to implement the radiant intensity of the LED 22 which is
suitable for sending the IrDA data signal from the IrDA controller
2 nor a remote control driver 43 to be current generating means for
regulating a current to flow to the LED 22 in order to implement
the radiant intensity of the LED 22 which is suitable for sending a
remote control signal from the remote controller 3, and the LED 22
is not driven. b) In the case in which the PWDOWN terminal 25 has
L, the TX-RC terminal 24 has L and the TXD terminal 27 has a high
level (H) or the PWDOWN terminal 25 has L, the TX-RC terminal 24
has H and the TXD terminal 27 has H, the switch 41 is brought into
such a state as to transmit a signal to the IrDA driver 42 and the
LED 22 is driven in an IrDA data signal transmitting mode. c) In
the case in which the PWDOWN terminal 25 has L, the TX-RC terminal
24 has H and the TXD terminal 27 has L, the switch 41 is brought
into such a state as to transmit a signal to the remote control
driver 43 and the LED 22 is driven in a remote control signal
transmitting mode. d) In the case in which the PWDOWN terminal 25
has H, the TX-RC terminal 24 has L and the TXD terminal 27 has L,
the switch 41 is brought into such a state as to transmit a signal
to neither the IrDA driver 42 nor the remote control driver 43, and
the LED 22 is not driven. e) In the case in which the PWDOWN
terminal 25 has H, the TX-RC terminal 24 has L and the TXD terminal
27 has H, the PWDOWN terminal 25 has H, the TX-RC terminal 24 has H
and the TXD terminal 27 has L, or the PWDOWN terminal 25 has H, the
TX-RC terminal 24 has H, and the TXD terminal 27 has H, that is,
the PWDOWN terminal 25 has H, and the TX-RC terminal 24 or the TXD
terminal 27 has H, the switch 41 is brought into such a state as to
transmit a signal to the remote control diver 43 and the LED 22 is
driven in the remote control signal transmitting mode.
[0051] In the "a" to "e", in the case in which the PWDOWN terminal
25 has L, a power down controller 44 for causing a portion (a
received signal processing portion 40) including a low-pass filter,
a comparator and pulse shaping through which a received signal
passes to be non-conductive is not driven but the received signal
processing portion 40 is brought into a conductive state so that a
receiving circuit is turned ON. In the case in which the PWDOWN
terminal 25 has H, the power down controller 44 for causing the
received signal processing portion 40 to be non-conductive is
driven and the received signal processing portion 40 is brought
into the non-conductive state so that the receiving circuit is
turned OFF.
[0052] A pad 47 of the driving device 21 shown in FIG. 7 is
connected to an RXD terminal 26 and another pad portion 49 is
connected to a ground or a power source, and an LEDA terminal 28
shown in FIG. 5 is connected to an LEDVCC 5 and another terminal 29
is connected to the ground or the power source. Apad portion 10
indicated by another pad portion 49 in FIG. 7 is a terminal for
transmitting a signal from the driving device 21 to the LED 22 to
be the light emitting device, and pad portions 1 and 2 indicated by
the pad portion 49 are terminals for causing the driving device 21
to receive a signal from the photodiode 20 to be the light
receiving device.
[0053] When the IrDA controller 2 and the remote controller 3 are
provided separately (FIG. 5), the states indicated as "a" to "e" of
the IrDA module 1 having a remote control transmitting function in
the Table 1 are combined to carry out a data communication by
mobile phones mounting the IrDA module 1 having a remote control
transmitting function or the remote control of electric household
appliances using the mobile phone mounting the IrDA module 1 having
a remote control transmitting function.
[0054] For example, when data such as a telephone number are to be
transmitted or received by using the IrDA module 1 having a remote
control transmitting function between mobile phones, the mobile
phone on a data transmitting side is brought into the state of "b"
in the Table 1 through a CPU 4 of the mobile phone which is mounted
on the mobile phone and a data transmission is then started. More
specifically, the IrDA controller 2 is selected on the transmitting
side, and the switch 41 in FIG. 7 is brought into such a state as
to transmit a signal to the IrDA driver 42 and a signal sent from
the IrDA controller 2 in FIG. 5 is input from the TXD terminal 27
to drive the IrDA driver 42 in FIG. 7, and the driven IrDA driver
42 drives the LED 22, thereby transmitting the IrDA data signal
with aradiant intensitycorrespondingtotheIrDAsignal transmitting
function.
[0055] On a receiving side, the mobile phone is set in the state
of"a" in the Table 1, and the receiving circuit is ON. Therefore,
the IrDA data signal is received from the transmitting side through
the photodiode 20 shown in FIG. 7 and the IrDA data signal is
caused to pass through the received signal processing portion 40.
Consequently, a noise included in the received IrDA data signal is
removed to carry out waveform shaping, and the same signal is then
transmitted to the CPU 4 of the mobile phone through the IrDA
controller 2 in FIG. 5 via a pad 8 of the driving device 21 and the
RXD terminal 26 of the IrDA module 1 having a remote control
transmitting function which is connected to the pad 8 of the
driving device 21.
[0056] When the electric household appliances are to be controlled
remotely by using.the IrDA module 1 having a remote control
transmitting function, moreover, the remote controller 3 in FIG. 7
is selected by the CPU 4 of the mobile phone which is mounted on
the mobile phone in FIG. 5, the switch 41 is brought into such a
state as to transmit a signal to the remote control driver 43, a
signal sent from the remote controller 3 in FIG. 5 is input from
the TX-RC terminal 24 to drive the remote control driver 43 in FIG.
7, and the driven remote control driver 43 drives the LED 22,
thereby transmitting a remote control signal with a radiant
intensity corresponding to the remote control transmitting
function.
[0057] In the case in which the controller 50 serving as an
IrDA/remote controller in which the IrDA controller 2 and the
remote controller 3 are used together is utilized (FIG. 6), the pad
7(46) and the pad 9(48) in the driving device 21 shown in FIG. 7
are connected to two input terminals, that is, the PWDOWN terminal
25 and the TXD terminal 27 to be the data signal input terminal
through wire bonding or a wiring pattern respectively. Therefore,
the IrDA module 1 having a remote control transmitting function
carries out four operations of "f" to "i" shown in Table 2
depending on a signal state into the two input terminals.
2 TABLE 2 INPUT Status PWDOWN TXD LED Mode Receiver f L L OFF ON g
L H IrDA ON h H L OFF OFF i H H Remote OFF
[0058] More specifically, f). in the case in which the PWDOWN
terminal 25 has L and the TXD terminal has L, the switch 41 is
brought into such a state as to transmit a signal to neither the
IrDA driver 42 nor the remote control driver 43, and the LED 22 is
not driven. g) In the case in which the PWDOWN terminal 25 has L
and the TXD terminal 27 has H, the switch 41 is brought into such a
state as to transmit a signal to the IrDA driver 42 and the LED 22
is driven in the IrDA data signal transmitting mode. h) In the case
in which the PWDOWN terminal 25 has H and the TXD terminal 27 has
L, the switch 41 is brought into such a state as to transmit a
signal to neither the IrDA driver 42 nor the remote control driver
43, and the LED 22 is not driven. i) In the case in which the
PWDOWN terminal 25 has H and the TXD terminal 27 has H, the switch
41 is brought into such a state as to transmit a signal to the
remote control driver 43 and the LED 22 is driven in the remote
control signal transmitting mode.
[0059] In the "f" to "i",. in the case in which the PWDOWN terminal
25 has L, the power down controller 44 for causing the received
signal processing portion 40 to be non-conductive is not driven but
the received signal processing portion 40 is brought into a
conductive state so that the receiving circuit is turned ON. In the
case in which the PWDOWN terminal 25 has H, the power down
controller 44 for causing the received signal processing portion 40
to be non-conductive is driven and the received signal processing
portion 40 is brought into the non-conductive state so that the
receiving circuit is turned OFF.
[0060] While the signal is input from the controller 50 serving as
an IrDA/remote controller to the TXD terminal 27 to be the data
signal input terminal in the embodiment, it is also possible to
carry out such a design as to produce the same advantages even if
the signal is input from the controller 50 serving as an
IrDA/remote controller to the TX-RC terminal 24 to be the remote
control signal input terminal in place of the TXD terminal 27. It
is also possible to create a state in which the LED 22 is always
driven in the remote control signal mode by using the TX-RC
terminal 24 in place of the TXD terminal 27.
[0061] The invention is not restricted to the embodiment but all
designs and changes are included in the invention without departing
from the scope of the matters described in the claims. For example,
the numbers of the controllers and the input terminals are not
restricted to those described above. Moreover, the relationship
between the operations of the input terminal and the IrDA module is
only illustrative. Furthermore, examples of the mobile terminal
mounting the IrDA module according to an example of the light
receiving and emitting electronic apparatus include a mobile phone,
a notebook computer, a personal organizer, and a hand-held PC, and
all of terminals which can be carried by people in an ordinary
life. In addition to the mobile terminal, referring to the IrDA
module according to an example of the light receiving and emitting
electronic apparatus in accordance with the invention, it is also
possible to mount an electronic apparatus in a daily life other
than the mobile terminals, for example, electric household
appliances or any apparatus which is operated electrically.
* * * * *